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The Ilyushin Il-4 (DB-3F) (Russian: Ильюшин Ил-4 (ДБ-3Ф)) was a Soviet twin-engined long-range bomber and torpedo bomber, widely used by the Soviet Air Force and the Soviet Naval Aviation during the World War II.In 1938, the Ilyushin design bureau redesigned the Ilyushin DB-3 to ease production and improve its performance, the revised version receiving the designation DB-3F (Forsirovanniye or "boosted"). The aircraft's internal structure, particularly the wings, was extensively changed, eliminating the need for hand finishing of the structure, and with duralumin replacing the large scale use of steel in the earlier version. The aircraft's fuel system was redesigned, increasing its internal capacity while reducing the number of fuel tanks.The fuselage nose was lengthened to give more room for the navigator/bombardier while reducing drag. The prototype DB-3F, powered by the same 949 hp (708 kW) Tumansky M-87B engines of the DB-3M, was piloted on its maiden flight by Vladimir Kokkinaki on 21 May 1939.] It successfully passed through state acceptance tests and entered production in January 1940, with the 1,100 hp (820 kW) Tumansky M-88 quickly replacing the M-87.
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